Please don't use temporary, throwaway email addresses or addresses that you may lose control of in the future. You will not be able to change the registered e-mail after signing up, and may need access to it in order to reset your password or validate account ownership.
A valid E-mail address is used to verify the account, recover your password and receive security notifications.
Only one account per E-mail address.
If your e-mail is blacklisted and it shouldn't, ask for help in Discord.